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#1
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cold start
I have a 1990 500 SL. Something abruptly changed in that it runs very bad for about a minute. Starts fine but acts like no cold enrichment. If you let it idle a bit it runs fine. I noticed that when this happened the mpg (vacuum indicator) pegs left. I have noticed that a couple of times it seems OK with the mpg working. Any ideas? Does anyone have a complete vacuum diagram and layout?
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#2
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Classic vacuum leak symptoms. The quick and dirty way to trace is to get a can of spray carburetor cleaner and spray all fittings, joints,and terminations. When you find the culprit, the engine will change speed noticeably.
If you have no success with that method, the the leak would be in a control system, so you need to get a vacuum diagram for your particular model and trace out each circuit. Many public libraries subscribe to such services as Alldata or Mitchell Online and you can print out diagrams for a few cents a page. If you plan to work on your car, a CD-ROM of the factory service manual is available at www.mercedsmanuals.com , or occasionally on E-Bay. There are some hard plastic tubes that go to various vacuum devices that are known to get incredibly fragile with age, so be careful. you may even want to replace them as a matter of prevention. Mine were so brittle that they shattered like spun sugar. I had a protective sleeve with 7 going in the top and 6 coming out the bottom. With three broken off inside. It ran much better after they were all replaced. It took about 8 hours, but that included two parts runs for more tubing. The main things you need are a diagram and a lot of patience.
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Remember, it's not just a car. It's an Adventure. |
#3
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thanks
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#4
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I'd start with the vac line on the back of the intake. It's known to fall apart at the rubber elbow...this is the line that runs directly to the economy gauge
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1987 560SL 85,000 miles Meet on the level, leave on the square. Great words to live by Were we directed from Washington when to sow and when to reap, we should soon want bread. - Thomas Jefferson: Autobiography, 1821.
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